The cutting tips for the 700 have 65amps marked on them, if your running the 700 flat out then this could be why they are not lasting.Cant find a problem with the machine. It looking very much like its the torch so Rob at Xtreme has put a new torch on it. I'll let you know next week when I have had a chance to test it.
After using this R-Tech for the past few weeks the torch's are much better than the Trafimet supplied with the Oxford, and the consumables last much longer.